I call this code on the startup of the application, but if I call it again, it crashes without any errors.

Qt Code: 
  1. void MCM::repopWList()
  2. {
  3.     QDir mcDir = QDir(McFolder);
  4.     QDir backupsDir = QDir(McFolder);
  5.     mcDir.cd("saves");
  6.     backupsDir.cd("MCM/backups");
  7.     mcDir.setFilter(QDir::Dirs | QDir::NoDotAndDotDot);
  8.     backupsDir.setFilter(QDir::Dirs | QDir::NoDotAndDotDot);
  9.  
  10.     ui->worldList->clear();
  11.  
  12.     //list the worlds
  13.     QFileInfoList mcDirList = mcDir.entryInfoList();
  14.     for (int i = 0; i < mcDirList.size(); i++) {
  15.         QFileInfo fileInfo = mcDirList.at(i);
  16.         ui->worldList->addItem(fileInfo.fileName());
  17.     }
  18.     QFileInfoList backupsDirList = backupsDir.entryInfoList();
  19.     for (int i = 0; i < backupsDirList.size(); i++)
  20.     {
  21.         bool wExist = false;
  22.         QFileInfo backupInfo = backupsDirList.at(i);
  23.         for (int j = 0; j < ui->worldList->count(); j++)
  24.         {
  25.             string itemText = ui->worldList->item(j)->text().toStdString();
  26.             if (itemText == backupInfo.fileName().toStdString())
  27.             {
  28.                 wExist = true;
  29.             }
  30.         }
  31.         if (wExist == false)
  32.         {
  33.             QString newWorld(backupInfo.fileName());
  34.             ui->worldList->addItem(newWorld);
  35.         }
  36.     }
  37. }
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